无法删除列表中的 'certain' 个空项

Question

我已经编码了一段时间，但最近我遇到了一个冲突问题。由于某种原因，在打印的 "Third Stage" 上，列表中仍有空项。这很奇怪，因为一段代码应该删除所有为空的项目，但有些项目仍然存在。 . . .

我发现的唯一问题是包含两个逗号的字符串“,,”和 that 之间不会被删除。

不幸的是，我无法解决这个问题，也没有找到任何可以帮助解决我的情况的方法。预先感谢您提供的任何帮助！

SpecificPlayerChat = "!get specific player chat log:  ,   ,, ,,, username | category"
#Removing all spaces found within the string
SpecificPlayerChat = SpecificPlayerChat.replace(" ","").strip().replace("\n","")
print("First Stage:", SpecificPlayerChat)

#Store the string username & category data only and split the rest into a "junk" string
junk,SpecificPlayerChatData = SpecificPlayerChat.split(":")
print("Second Stage:", SpecificPlayerChatData)
junk = "" #This string deleted the unwanted string

#Split the usernames and categories into two separate strings
usernames,categories = SpecificPlayerChatData.split("|")
print("Third Stage:", usernames)

#Split the multiple words or "no words" into an item each to be store in a list
usernamelist = []
categorylist = []
usernamelist = usernames.split(",")
categorylist = categories.split(",")

#remove any empty items
print("   Print Empty items:")
for item in usernamelist:
    if item is '':
        usernamelist.remove(item)
        print("     Empty Item Detected!")
print("Third Stage ", usernamelist)

Answer 1

这幅画有展示吗？

print("     Empty Item Detected!")

试试这个而不是删除：

将此替换为：

for item in usernamelist:
if item is '' or item is null:
    usernamelist.remove(item)
    print("     Empty Item Detected!")

有了这个：

for item in usernamelist:
if item is '' or item is null:
    del usernamelist[usernamelist.index(item)]
    print("     Empty Item Detected!")

参考资料：https://www.w3schools.com/python/ref_keyword_del.asp， https://www.programiz.com/python-programming/methods/list/index

Answer 2

您正在迭代列表的同时修改它。试试这个：

usernamelist = [i for i in usernamelist if i]

在这种情况下 if i 就像 if len(i) > 0。一般来说，记住 '' == False.

如果你想保持循环，那么使用enumerate()

for i, item in enumerate(usernamelist):
    if item == '': #you can use "if not item:" instead
        usernamelist.remove(item)
        print("     Empty Item Detected!")

无法删除列表中的 'certain' 个空项

Unable to remove 'certain' empty items inside list

python

string

replace

element

list